3L CORP-Mounting Squares: Repositionable. All products in the 3L Scrapbook Adhesive line is guaranteed to be archival safe; acid and lignin free; acrylic based and PAT tested and approved. This package contains 500 1/2in white adhesive squares that are repositionable for up to 5 minutes after adhering them to photos; paper; acrylic and much more. Imported.